real property
(6) Other special rules (A) Interest in real property The term “interest in real property” includes fee ownership and co-ownership of land or improvements thereon, leaseholds of land or improvements thereon, options to acquire land or improvements thereon, and options to acquire leaseholds of land or improvements thereon. (B) Real property includes associated personal property The term “real property” includes movable walls, furnishings, and other personal property associated with the use of the real property. (C) Constructive ownership rules For purposes of determining under paragraph (3) whether any person holds more than 5 percent of any class of stock and of determining under paragraph (5) whether a person holds a controlling interest in any corporation, section 318(a) shall apply (except that paragraphs (2)(C) and (3)(C) of section 318(a) shall be applied by substituting “5 percent” for “50 percent”).